43.
The method that cannot be used for removing permanent hardness of water is
A. adding sodium carbonate
B. distillation
C. adding caustic soda
D. boiling
Answer & Explanation
Answer: Option D
Explanation:
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44.
The following are the half lives of four active isotopes. Which one of the following is the most dangerous to handle?
A. 3 billion years
B. 100 years
C. 0.01 minute
D. 13 days
Answer & Explanation
Answer: Option C
Explanation:
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45.
The gas used for artificial ripening of green fruit is
A. ethylene
B. ethane
C. carbon dioxide
D. acetylene
Answer & Explanation
Answer: Option A
Explanation:
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46.
Zone refining is used for the purification of
A. Au B. Ge
C. Ag D. Cu
Answer & Explanation
Answer: Option B
Explanation:
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47.
The main chemical constituent of the oil of cardamom which is responsible for flavour of this oil is
A. cineole B. engenol
C. geraniol D. limonene
Answer & Explanation
Answer: Option A
Explanation:
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48.
The molecule which has the highest percentage of ionic character among the following is
A. HI B. HF
C. HCI D. HBr
Answer & Explanation
Answer: Option B
Explanation:
No answer description available for this question.